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Dietary nitrate improves sprint performance and cognitive function during prolonged intermittent exercise
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Dietary nitrate improves sprint performance and cognitive function during prolonged intermittent exercise
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Journal Article
Dietary nitrate improves sprint performance and cognitive function during prolonged intermittent exercise
2015
Overview
It is possible that dietary nitrate (NO
3
−
) supplementation may improve both physical and cognitive performance via its influence on blood flow and cellular energetics.
Purpose
To investigate the effects of dietary NO
3
−
supplementation on exercise performance and cognitive function during a prolonged intermittent sprint test (IST) protocol, which was designed to reflect typical work patterns during team sports.
Methods
In a double-blind randomised crossover study, 16 male team-sport players received NO
3
−
-rich (BR; 140 mL day
−1
; 12.8 mmol of NO
3
−
), and NO
3
−
-depleted (PL; 140 mL day
−1
; 0.08 mmol NO
3
−
) beetroot juice for 7 days. On day 7 of supplementation, subjects completed the IST (two 40-min “halves” of repeated 2-min blocks consisting of a 6-s “all-out” sprint, 100-s active recovery and 20 s of rest), on a cycle ergometer during which cognitive tasks were simultaneously performed.
Results
Total work done during the sprints of the IST was greater in BR (123 ± 19 kJ) compared to PL (119 ± 17 kJ;
P
< 0.05). Reaction time of response to the cognitive tasks in the second half of the IST was improved in BR compared to PL (BR first half: 820 ± 96 vs. second half: 817 ± 86 ms; PL first half: 824 ± 114 vs. second half: 847 ± 118 ms;
P
< 0.05). There was no difference in response accuracy.
Conclusions
These findings suggest that dietary NO
3
−
enhances repeated sprint performance and may attenuate the decline in cognitive function (and specifically reaction time) that may occur during prolonged intermittent exercise.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V
